#box {
    position:relative;
}
#box .small_pic {
    width:60px;
    height:68px;
}
#box .small_pic img {
    width:100%;
    height:100%;
}
#box .small_pic .slider {
    width:20px;
    height:25px;
    background:rgba(255,255,255,.3);
    position:absolute;
    cursor:move;
    display:none;
}
#box .big_pic {
    position:absolute;
    top:0;
    left:100px;
    width:100px;
    height:100px;
    border:1px solid #ccc;
    overflow:hidden;
    display:none;
    z-index: 9999;
}
#box .big_pic img{
    position:absolute;
}
